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Cloud Seeding experimental programme in Rhodesia, 1974-75

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Results of seeding single cumulus cells in 1974-75 (and also 1973-74) are summarised. The silver iodide treatment appeared to increase the rainfall when cloud tops were -13C or colder. This article includes photographs of the rain collector, designed to measure precipitation produced by experimental clouds - apparatus which had never been used before for that purpose, anywhere in the world... [Journal of Weather Modification, USA, 1977; vol. 9, pp. 79-92].
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During the three seasons 1968/69, 1973/74 and 1974/75, randomized experiments were carried out in Rhodesia on 58 isolated cumulus cloud systems with tops colder than -10C, 36 being seeded and the other 22 left alone.... A comparison .... shows that a modest average rain increase can be expected by seeding Rhodesian clouds with tops colder than -10C, but a much larger increase is likely if this threshold is raised to -13C.
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